Universität zu Köln

Angst, Manuel ORCID: 0000-0001-8892-7019, Adiga, Shilpa, Gorfman, Semen, Ziolkowski, Michael, Strempfer, Joerg, Grams, Christoph, Pietsch, Manuel and Hemberger, Joachim (2019). Intrinsic Ferroelectricity in Charge-Ordered Magnetite. Crystals, 9 (11). BASEL: MDPI. ISSN 2073-4352

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Abstract

Single crystalline magnetite Fe3O4 was investigated at low temperatures in the charge ordered state by electric measurements and time-resolved diffraction with voltage applied in-situ. Dielectric spectroscopy indicates relaxor ferroelectric characteristics, with polarization switching observably only at sufficiently low temperatures and in a suitably chosen time-window. PUND measurements with a ms time scale indicate a switchable polarization of about 0.6 mu C/cm(2). Significant switching occurs only above a threshold field of about 3 kV/mm, and it occurs with a time delay of about 20 mu s. The time-resolved diffraction experiment yields, for sufficiently high voltage pulses, a systematic variation by about 0.1% of the intensity of the (2, (2) over bar, (10) over bar) Bragg reflection, which is attributed to structural switching of domains of the non-centrosymmetric Cc structure to its inversion twins, providing proof of intrinsic ferroelectricity in charge ordered magnetite.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Angst, Manuel UNSPECIFIED orcid.org/0000-0001-8892-7019 UNSPECIFIED Adiga, Shilpa UNSPECIFIED UNSPECIFIED UNSPECIFIED Gorfman, Semen UNSPECIFIED UNSPECIFIED UNSPECIFIED Ziolkowski, Michael UNSPECIFIED UNSPECIFIED UNSPECIFIED Strempfer, Joerg UNSPECIFIED UNSPECIFIED UNSPECIFIED Grams, Christoph UNSPECIFIED UNSPECIFIED UNSPECIFIED Pietsch, Manuel UNSPECIFIED UNSPECIFIED UNSPECIFIED Hemberger, Joachim UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-128787
DOI:	10.3390/cryst9110546
Journal or Publication Title:	Crystals
Volume:	9
Number:	11
Date:	2019
Publisher:	MDPI
Place of Publication:	BASEL
ISSN:	2073-4352
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language FE3O4; DIFFRACTION; TRANSITION; CONDUCTION; CRYSTAL Multiple languages Crystallography; Materials Science, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/12878